Abstract #1060

Performance Evaluation of a 128-Channel head-only Receiver array at 7 Tesla

Bernhard Gruber^1,2,3, Jason P. Stockmann^1,4,5, Azma Mareyam¹, Yulin Chang⁶, Boris Keil⁷, Berkin Bilgic^1,4, Alexander Beckett^8,9, David A. Feinberg^8,9, and Lawrence L. Wald^1,4,5

¹A.A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, United States, ²High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University Vienna, Vienna, Austria, ³BARNLabs, Muenzkirchen, Austria, ⁴Harvard Medical School, Boston, MA, United States, ⁵Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, United States, ⁶Siemens Medical Solutions USA Inc., Malvern, PA, United States, ⁷Department of Life Science Engineering, Institute of Medical Physics and Radiation Protection, Mittelhessen University of Applied Sciences, Gießen, Germany, ⁸Advanced MRI Technologies, Sebastopol, CA, United States, ⁹Helen Wills Neusoscience Institute, University of California, Berkeley, CA, United States

Synopsis

Keywords: RF Arrays & Systems, RF Arrays & SystemsThe performance of a 128-channel Rx-only 7T brain array was evaluated using simulations and measurements. SNR and g-factor maps show a significant performance increase for highly accelerated imaging in cortical areas from a combination of improved peripheral unaccelerated SNR and g-factor. Measured SNR in cortical areas increased by 42% from 32- to 128-ch and 18% from 64- to 128-ch. The 1/g-factor maps show an improved mean and a tighter distribution, with both effects becoming more pronounced at higher accelerations. At 6x2-fold the 128-channel array has 17.9% g-factor benefit over the 64-ch, and a 48.2% benefit over the 32-ch array.

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